Welcome to a new edition of Business Case — where we take a fictional but realistic scenario, run the numbers, and show you what the cost of inaction really looks like.
Accounts payable is the process everyone assumes is fine. Invoices come in, someone checks them, someone approves them, the money goes out — it has worked this way for decades, and no customer ever complains about it. That is exactly why it deserves a business case: because nobody is watching, invoice processing has quietly become one of the most expensive routine processes in the mid-sized company. Every invoice that travels through inboxes instead of a workflow costs real handling time, every week it idles costs an early-payment discount, and every late payment costs fees and supplier goodwill.
The timing argument is even simpler. Electronic invoicing has stopped being optional in Germany — businesses have been required to be able to receive structured e-invoices since the beginning of last year, and the remaining transition periods for sending are running out. Most companies have answered this obligation at the minimum level: they can technically receive an e-invoice, which then gets printed, mailed around, and approved exactly like paper. The mandate has put a structured, machine-readable document at the start of the process. What happens behind it is still manual. Today's business case is about that gap — what it costs, and the three levers that close it.
Meet Lohberg Kunststofftechnik GmbH: a fictional but familiar plastics manufacturer based in Osnabrück, founded in 1972, producing injection-moulded components for the automotive, appliance, and medical industries at two plants. Lohberg employs 850 people and generates 240 million euros in annual revenue, with an operating profit of around 11 million euros. Its purchasing volume runs at roughly 150 million euros a year — granulates and additives, tooling, maintenance, logistics, and services — arriving as approximately 78,000 supplier invoices annually.
The accounts payable team is experienced and works hard. And yet the numbers, once someone finally assembled them, told an uncomfortable story. The fully loaded cost of processing one invoice sits near seventeen and a half euros; digitised peers with automated matching process comparable invoices for around six. An invoice takes on average 19 working days from arrival to approved payment; the benchmark is five. Thirty-eight percent of invoices need at least one manual clarification round — a missing order reference, a price that does not match, an approver on holiday — against a best-practice exception rate below 15 percent. The company captures only about a fifth of the early-payment discounts its suppliers offer, and more than one invoice in five is paid late, generating reminder fees and increasingly annoyed key suppliers.
None of these figures appears in any monthly report. The department is not failing; it is fully occupied keeping a manual process alive. The CFO's question, prompted by yet another lost discount on a six-figure granulate invoice, is the question this series always starts with: what is this actually costing us, and what would it take to stop it?
When a small team traced how invoices really move through Lohberg, three structural problems came into focus. They are the standard failure modes of accounts payable in companies that digitised the document but never the process.
The first problem is that there is no single, structured entrance. Invoices arrive as paper at two plants, as PDFs in half a dozen mailboxes — the buyer's, the plant manager's, occasionally a personal inbox — and, since the e-invoicing mandate, as structured XML that is promptly converted to PDF and printed. It takes on average six days before an invoice even exists in the accounting system. On the way, invoices get lost and re-requested, some arrive twice through different channels, and duplicates occasionally get paid twice — discovered, if at all, months later.
The second problem is that verification and approval run on e-mail and memory. There is no systematic three-way match between invoice, purchase order, and goods receipt; the check happens by a clerk who knows whom to ask. Approvals travel as forwarded PDFs with "please approve" in the subject line, wait in inboxes, and leave no trail beyond the mail thread. This is where the 38 percent clarification rate lives, and it is why the process takes 19 days: not because anyone works slowly, but because the invoice spends most of its life waiting for a human to push it along — the same idle-time pattern we saw on the ordering side in our business case on slow procurement approvals. By the time the invoice is approved, the fourteen-day discount window closed a week ago.
The third problem is that nobody sees the process, only the payments. Finance knows the total payables and the month-end cash position. Nobody knows which suppliers' invoices always need clarification and why, which approvers are the bottleneck, which invoice formats produce the most exceptions, or how much discount was silently forfeited last quarter. Every exception is handled as a one-off favour and leaves no data behind — so the same supplier causes the same clarification round every month, a pattern we examined more generally in our quick tips on handling exceptions without breaking flow.
These three problems compound into a cost surface that is remarkably large for such an unglamorous process. Start with handling: across 78,000 invoices, the gap between Lohberg's seventeen and a half euros and the six-euro benchmark is eleven and a half euros per invoice; applied conservatively to only the 60 percent of volume that is realistically addressable in a first phase, that is roughly 0.55 million euros a year in excess processing and rework. Add the discounts: on the roughly 60 million euros of purchasing volume where suppliers offer early-payment terms of around two percent, Lohberg currently captures barely a fifth — closing even most of that gap is conservatively worth 0.7 million euros a year. Add late-payment fees, the occasional double payment, and the audit effort of reconstructing approvals from mail threads: an estimated 0.25 million euros annually. In total, the invisible cost of Lohberg's invoice process is on the order of 1.5 million euros a year — roughly 14 percent of operating profit, spent on a process whose entire job is to pay for things the company already decided to buy.
The path forward is not a new ERP and not headcount. It is three integrated levers that turn invoice processing from a chain of inboxes into a structured, largely touchless process. Each lever maps onto one of the three problems above.
The first lever is a single digital entrance for every invoice. All channels converge on one intake: e-invoices are read directly as structured data, PDFs and remaining paper are captured and validated at arrival. Every invoice exists in the system on day zero, is checked automatically for duplicates and formal completeness, and carries its order reference from the start — suppliers without one get an automated request the same day, not a phone call in week three. For Lohberg, this lever alone removes the six lost days at the front of the process and most duplicate risk, recovering roughly 0.3 million euros a year. It costs about 90,000 euros in the first year for capture tooling and channel consolidation, and around 35,000 euros a year to run.
The second lever is a workflow with an automated three-way match and a clear approval matrix. Invoices that match their purchase order and goods receipt within defined tolerances flow through without a human touch and are scheduled for payment inside the discount window — for a manufacturer like Lohberg, realistically half to two-thirds of volume once master data is cleaned up. Only genuine deviations route to a named approver, with the order, receipt, and deviation attached, so the clarification is one decision instead of an e-mail hunt. Cycle time falls from 19 working days toward five, the clarification rate falls toward the benchmark, and the discount window changes from an exception to the default. This lever recovers roughly 0.65 million euros a year — the largest share of it in captured discounts — at about 120,000 euros in year one and 45,000 euros annually.
The third lever is process mining on the invoice data, feeding a monthly accounts payable review. Once invoices flow through one workflow, the process becomes visible: which suppliers or formats cause the exception clusters, where approvals stall and with whom, how the touchless rate and discount capture develop plant by plant. This is the domain of process intelligence tooling — the category in which noreja operates, catalogued alongside peers on directories such as topai.tools. The review turns those findings into named fixes: the supplier who is moved to e-invoicing, the tolerance rule that is adjusted, the approver whose deputy rule finally gets configured. It recovers a further 0.25 million euros a year, on tooling and governance costing about 60,000 euros fully loaded — and it is the lever that keeps the other two honest, because you cannot improve a touchless rate you cannot see.
Combined, the three levers recover roughly 1.2 of the 1.5 million euros of annual cost in steady state — about four-fifths of the leak. First-year implementation, including training and master-data cleanup, comes in at approximately 300,000 euros, with annual run costs around 140,000 euros thereafter. Payback is reached within the first months after rollout. And there is a strategic dividend the numbers understate: a company that pays reliably inside the discount window becomes a preferred customer — which is worth real money the next time capacity is scarce.
Do you know, today, what one invoice costs your organisation to process — and would your number survive including the clarification rounds, the reminders, and the audit reconstruction?
What share of your invoices could be approved by no one at all, because order, goods receipt, and invoice already agree — and why are humans still reading them?
How much early-payment discount did your company forfeit last quarter, and in which report would anyone have seen it?
Which three suppliers cause the most clarification rounds in your accounts payable — and if you cannot name them, who could?
If invoices arrive as structured data under the e-invoicing mandate anyway, what exactly is your argument for processing them manually behind the intake?
Invoice processing is expensive precisely because it feels cheap: no customer sees it, no report isolates it, and the people running it are visibly busy. But a process that touches every euro leaving the company deserves the same scrutiny as any production line. The fix is neither exotic nor disruptive — one structured entrance for every invoice, an automated match that lets the routine flow through untouched inside the discount window, and process mining that shows finance where the exceptions cluster and the days disappear. The e-invoicing mandate has already standardised the document; the companies that win are the ones that let the process catch up with it.
We invite you to look at your own numbers with Lohberg's lens. Take last month's invoices and measure three things: the true cost per invoice, the share that needed at least one clarification round, and the discounts you left on the table. Then decide whether that is a process you want to fund for another year.
In mid-sized companies with paper- and e-mail-based processes, fully loaded costs typically run between fifteen and twenty euros per invoice, once clarification rounds, reminders, and audit effort are included. Digitised organisations with automated three-way matching process comparable invoices for five to seven euros — the gap, multiplied by tens of thousands of invoices, is usually a six-figure annual amount.
Touchless processing means an invoice is captured, matched against its purchase order and goods receipt, approved, and scheduled for payment without any human touching it — because everything agrees within defined tolerances. Realistic touchless rates for manufacturers are fifty to seventy percent of volume, which frees the team to handle genuine exceptions properly.
Because the invoice spends its life waiting: days before it enters the system, more days in e-mail approval loops, more days in clarification. By the time payment is approved, the typical fourteen-day discount window has closed. Fixing intake and approval speed usually recovers more money in discounts than in handling costs.
The German mandate means invoices increasingly arrive as structured, machine-readable data — the ideal input for automated validation and matching. Companies that only fulfil the receiving obligation but keep processing manually leave the entire benefit unrealised: the document is digital, the process is not.
Process mining reconstructs how invoices actually flow: which suppliers and formats cause exception clusters, where approvals stall, how the touchless rate and discount capture develop. It turns accounts payable from a black box into a managed process and shows exactly where the next improvement is worth the most.